<div>just for the fun of it here is how far i have come.... still some tracks not there and a bit of clearance issues near the optoisolator</div><div> </div><div><br><br> </div><div class="gmail_quote">2013/6/11 Stuart Poulton <span dir="ltr"><<a href="mailto:stuart@poulton.org.uk" target="_blank">stuart@poulton.org.uk</a>></span><br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;padding-left:1ex;border-left-color:rgb(204,204,204);border-left-width:1px;border-left-style:solid">Ok.<br>
<br>
You should still design for 3 phase voltages. You should consider what would happen if the whole board were to become live.<br>
<br>
I'd be going with getting something like this installed<br>
<br>
<a href="http://www.shmmetershop.co.uk/DAB13000-3-Phase-N-ABB-DeltaPlus-MID-Approved-Multifunction-meter-with-Pulse-Output.html" target="_blank">http://www.shmmetershop.co.uk/<u></u>DAB13000-3-Phase-N-ABB-<u></u>DeltaPlus-MID-Approved-<u></u>Multifunction-meter-with-<u></u>Pulse-Output.html</a><br>

<br>
Again, I still havn't heard what the perceived benefit of 'accurate voltage' measurement is ? How are you planning to measure current ?<br>
<br>
Stuart<br>
<br>
On 11/06/13 14:26, Bo Herrmannsen wrote:<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;padding-left:1ex;border-left-color:rgb(204,204,204);border-left-width:1px;border-left-style:solid">
oh.. no one board for each pahse.... i have 3 sockets over the fuse box.. clearly marked with what phase it goes to.... not excatly legal, but that part i can live with...<br>
<br>
/bo<br>
<br>
2013/6/11 Stuart Poulton <<a href="mailto:stuart@poulton.org.uk" target="_blank">stuart@poulton.org.uk</a> <mailto:<a href="mailto:stuart@poulton.org.uk" target="_blank">stuart@poulton.org.uk</a>><u></u>><br>

<br>
    Ok.<br>
<br>
    Don't forget PCB design criteria change with 3 phase. You may find<br>
    this of use<br>
<br>
    <a href="http://ww1.microchip.com/downloads/en/DeviceDoc/51723a.pdf" target="_blank">http://ww1.microchip.com/<u></u>downloads/en/DeviceDoc/51723a.<u></u>pdf</a><br>
<br>
    Stuart<br>
<br>
    On 11/06/13 14:18, Bo Herrmannsen wrote:<br>
<br>
        yep, 3phase is standard here (almost) 3phases+neutral+earth<br>
<br>
        2013/6/11 Stuart Poulton <<a href="mailto:stuart@poulton.org.uk" target="_blank">stuart@poulton.org.uk</a><br>
        <mailto:<a href="mailto:stuart@poulton.org.uk" target="_blank">stuart@poulton.org.uk</a>> <mailto:<a href="mailto:stuart@poulton.org.uk" target="_blank">stuart@poulton.org.uk</a><br>
        <mailto:<a href="mailto:stuart@poulton.org.uk" target="_blank">stuart@poulton.org.uk</a>><u></u>>><br>
<br>
            Bo,<br>
<br>
            Can you clarify, are you talking about voltage and current<br>
            measurement on a 3 phase supply ?<br>
<br>
            Thanks<br>
<br>
            Stuart<br>
<br>
<br>
            On 11/06/13 14:07, Bo Herrmannsen wrote:<br>
<br>
                hmm... i think you are right.. its the phase shift<br>
        part that<br>
                will benefit most from what i'm doing<br>
<br>
<br>
                i will also agree to that 0-100A is rather a hughe<br>
        step... for<br>
                me thats far beyound what i need, i can draw a max of<br>
        16A amps<br>
                on each of the 3phases i got in the fuse box<br>
<br>
                /bo<br>
<br>
<br>
                2013/6/11 Kevin Wood <<a href="mailto:kevin@the-wood-family.com" target="_blank">kevin@the-wood-family.com</a><br>
        <mailto:<a href="mailto:kevin@the-wood-family.com" target="_blank">kevin@the-wood-family.<u></u>com</a>><br>
                <mailto:<a href="mailto:kevin@the-wood-family.com" target="_blank">kevin@the-wood-family.<u></u>com</a><br>
        <mailto:<a href="mailto:kevin@the-wood-family.com" target="_blank">kevin@the-wood-family.<u></u>com</a>>><br>
                <mailto:<a href="mailto:kevin@the-wood-family.com" target="_blank">kevin@the-wood-family.<u></u>com</a><br>
        <mailto:<a href="mailto:kevin@the-wood-family.com" target="_blank">kevin@the-wood-family.<u></u>com</a>><br>
                <mailto:<a href="mailto:kevin@the-wood-family.com" target="_blank">kevin@the-wood-family.<u></u>com</a><br>
        <mailto:<a href="mailto:kevin@the-wood-family.com" target="_blank">kevin@the-wood-family.<u></u>com</a>>>>><br>
<br>
                    Indeed. Looking at the openenergy design, it's the<br>
        current<br>
                    monitoring side<br>
                    that would be the largest source of error due to<br>
        the fact<br>
                that it<br>
                    lacks<br>
                    resolution, especially at low power levels. A<br>
        couple of<br>
                current ranges<br>
                    rather than trying to do 0-100A in one range would<br>
        help<br>
                there (I think<br>
                    someone's proposed a design to do just that<br>
        somewhere).<br>
<br>
                    Measuring mains voltage through an off-the-shelf<br>
        step-down<br>
                transformer<br>
                    with a purely resistive load takes us back into the<br>
                comfort zone<br>
                    of most<br>
                    constructors as far as safety goes and I can't<br>
        believe it<br>
                    introduces much<br>
                    of an error if calibrated. Maybe a bit of phase<br>
        shift and<br>
                    flattening of<br>
                    the top of the waveform if the transformer is a<br>
        bit close to<br>
                    saturation?..<br>
                    Not sure. Will have to have a play with that.<br>
<br>
                    Kevin<br>
<br>
                    > I think the question here is what are the<br>
        benefits of<br>
                'almost error<br>
                    > free' mains voltage measurements ?<br>
                    ><br>
                    > Then compare to the risks, biggest being death,<br>
        or fire.<br>
                    ><br>
                    > Stuart<br>
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